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A. E. NORRMAN.

ADJUSTING DEVICE FOR DRAWING PENS.

APPLICATION FILED DEC. 16, 1915.

1 ,3 1 6,800 Patentd Sept. 23, 19 19.

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Specification of hetters Qatent. Patented Sept-23, 1919.

491 1 12 1 fil d. Qs mhe 5 .915- eri Y9- 2- T o allwwhom it may concern Be it known that I, Aunt NORRMAN, a subject of the Czar of Russia, residing at Portland, in the county of Cumberland and State of Maine, have invented new and useful Improvements in Adjusting Devices for Drawing-Pens, of which the following is a specification.

The present invention relates to an adjusts d v e a ap d t be made as a s par e article of manufacture capable of ready atchm n to a de a hm t r m th latively adjustable parts or members fer the regulation of which it is designed. Among other uses for which my attachment is in} tended, is that of providing one, or if desired two, additional adjustments to a drawing pen, such as the well known right-line ruling pens or compass pens 1 commgn and general use by draftsman; its purpose when used in this connection being to enable finer or coarser lines than those for which the P n itself is dj ed w h, QWeYsr, ar of a previously determined width, to be drawn at will, without disturbing the previous adjustment of the pen and enabling the pen to be restored to its previous adjustment without manipulation of the principal adjustment of the pen and without loss of The device or attachment for which my. invention is embodied is also adapted for other uses than in connection with drawing pens, wherefore the following description in connection with the drawings forming a part of this specification, is not to be taken as'a limitation of the invention to the particular use shown and described in detail, since such detailed description and illustration are intended to illustrate the principles of the invention and not to limit the range of application of such principles.

In the drawings,

Figure 1 is a side iew of a ruling pen having applied thereto the embodiment of my invention which. is best adapted for the purpose of adjusting the distance between the'nibs of such pen for securing nstant and exact alteration in the width of the line which may be drawn.

Fig. 2 is a iew similar to Fig, 1, but partly in section, showing the adjusting device and the adjacent parts of the pen in longitudinal section.

. Fig. 3 is a plan view of the same.

Fig. t is a sideelevation partly in section t e 1y thr u h Sha g ne of t ju tmen s at y lus in at a hmen F g. 5 is a similar elevation on a larger scale showing theuse ofthe attachment for securing a different adjustment of the pen. Fig. 6 a det il cross section on line 6 -6 ofFigl.

Fig. 7 is a perspective view of that part of the device which I call the base thereof.

Fig. 8 is a plan view of suchbase showing the part call the cam lever of the devi in swa -0 111 1 t e s 9 is a Per p t ve i o the 0 le er l The same reference characters indicate the same parts in all the i i It is to be noted that the adjusting device or attachment is designed and adapted to lee applied to the instrument with which is used wlthou-t necessitating any alteration in the construction of the instrument, h by it may be s l a p ie y t user to a standard instrument, and as easily deta h d theref e When appl d to a drawing pen it is adapted to be placed upon one of the blades of such pen and secured by the adjusting screw which is a part of the pen. In the drawing wherein I have shown my attachment applied to an ordinary drawing pen, 10 and 11 represent the blades of he pen which are relatively adju ta le th 91 ard and ma o the other, for regulating the width or thickness of the lines to be drawn. 12 represents the adjust n s re of the 11 1 ich pa s d a hole 13 the blade 11 and has a threaded shank 14 which meshes with the threads of a tapped hole in the blade 10. The pen illustrated is of the spring blade type in which one of the blades, as 10, is

relatively rigid, while the other is resilient an e di yie n irs re uced i kness at the part 15 adjacent to the stock or body 16 of the pen. My invention is equally applicable, however, to a pen of the well known pivoted blade type.

- tion with the heels friction-causing abutment 27 is As a convenient detail of construction, the base 17 is bent down at its side edges to provide flanges 20, 20 which have the double effect of stiffening the base and of positioning it on the blade 11. Between its ends said base has an aperture 21 suiiiciently large to admit the shank of the adjusting screw 12 freely, whereby it may be attached to the pen by said adjusting screw. Preferably also the base is notched or slotted at one end and the arms at each side of the slot are rolled up to provide bearings or grippers 22 for the pivot pin 19 on which the cam lever 18 is mounted, said lever residing between the grippers 22. The necessary supports for the pivot pin may, however, be otherwise formed if desired.

The part 18 which I have called for the purposes of this description a cam lever, is formed with a lever arm 23, a cam projection 24, and an operating arm 25. Said arm 23 and cam 24 may be included within the generic term heel used in this specification and in the following claims with a particular significance, to designate and include any projection or protuberance, however formed, in the nature of a cam or wiper adapted to perform essentially the functions and accomplish essentially the results which are performed and accomplished by the parts 23 and 24, as hereinafter more fully described.

These heels 23 and 24 are on opposite sides of the pivot 19, and when the cam lever is inoperative position shown in Figs. 1 and 2, both heels bear equally on the arm 11, and their points of bearing are on opposite sides of a line perpendicular to the arm 11 passing through the axis of the pivot 19. The operating arm 25 of the cam lever then extends over the head of the adjusting screw 12.

The cam lever also carries two adjustable abutments, 26 and 27 which act in conjunc- 23 and 24, respectively. The abutment 26 .is preferably a screw threaded through the arm 25 and adapted to bear 011 the head of the adjusting screw 12, being itself provided with a head 28 for more convenient adjustment. A spring 29 is interposed between this head 28 and the adjacent surface of the arm 25, exerting a pressure to preserve the the abutment 26. The other a set screw threaded into that side of the cam lever which faces the nib or point of the pen, with its axis ap proximately parallel to the length of the pen when the cam lever is in the neutral position shown in Figs. 1 and 2. The outer end of this set screw is adapted to co-act with the heel 24 by bearing against the blade 11, as shown in ,Fig. 4:. Such outer end constitutes the limiting abutment cooperative with the heel 24. The relation between this in the neutral or adjustments of abutment and the heel 24 may be further described as follows: When the cam lever is in the inoperative position, the abutment and heel are on the same side of a line passing through the pivotal axis of the cam lever perpendicular to the blade 11, and on opposite sides of a line passing through the same axis parallel to said blade. When the cam lever is brought into the position for cooperative action of heel 24: and abutment 27, such position being shown in Fig. 4, the heel and abutment both bear on the blade 11 on opposite sides of a line perpendicular to this blade passing through the pivot of the lever. The resilient force which tends to separate the blade 11 from the blade 10 acts parallel to such line, whereby the lines of thrust applied by the blade to the heel and abutment, respectively, pass on opposite sides of said pivotal axis and hold the cam lever in a position of equilibrium.

The utility and mode of use of the ad usting attachment in connection with a drawing pen are as follows. The base plate of the attachment is confined between the head of the adjusting screw 12 and the arm 11, being firmly held by the outward spring of the arm, and the cam lever is retained in the inoperative position by the pressure of the blade which bears and the lines of pressure of which extend on opposite sides of the pivot 19. The attachment then leaves the adjusting screw 12 free for manipulation to adjust the nibs of the pen to draw a line of any width or thickness desired. When it is desired to draw a finer line the adjusting device may be used in either of two ways. In one mode of use the draftsman presses with his forefinger on the head of the adjusting screw 28 until-the abutment 26 thereof bears against the head of the screw 12, which may be called for the purposes of this description the adjusting screw of the pen. Thereby the heel 23 is moved toward a position directly between the pivot 19 and blade 11, pressing this blade toward the opposite blade 10. In this action the base plate reacts against the head of the main adjusting screw, which is rigidly connected to the blade 10 and thereby affords a rigid reaction shoulder attached to the blade 10. Thus for the purpose of the application of adjusting pressure by the device, the base thereof may be considered as rigidly connected to one of the relatively adjustable members (the blade 10) and the cam lever as bearing against the other of these relatively adjustable members (the blade 11). By adjusting the abutment 26 toward or away from the screw 12, the movement given to the blade 1 and thereby the width of line adapted to be drawn by the pen after such movement or adjustment, may be exactly regulated. It will be evident that the above described manipulation of the adjusting deequally on both heels,

piece or element.

- so far as they apply to the lever, by the Y -construction shown in the drawings, in

Lvice puts'the pen in condition to draw a finer line of exactly] known and previously regulated width without disturbing the main adjusting screw, and that/when the cam :it is possible to draw lines of two different widths in alternation, or in any other desired arrangement, of which all the lines of each class will be exactly uniform in width, and

without loss of time.

The 'other adjustment of the pen is made in a similar manner by shifting the cam lever into the position shown in Fig. 4 until the abutment'27 brings up against the blade 11. The action of the heel 24 in this adjustirent is similar "to that of the heel 23, except that it passes by the perpendicular from the 'pi votto the blade 11 before the abutment 27 strikes the blade. Thedis'tance to whichthe heel 24 passes beyond this perpendicular, and thereby the abutment 27. The abutments 26 and 27 may be so set that the results accomplished by either mode of operation of the cam lever are the same, in which case suGh'two manipulations are different modes of accomplishing the same result, or the adjustme'nts'of the blades respectively effected maybe different, in which case the attachment provides for Obtaining instantly either one of two different widths of line, each of which is different from tha for whic the p n i set by its main adjusting screw;

The fact that the cam lever is retained when in the position of Fig.4: by the outward'pressureof the arm 11, makes it possible to usedthe attachment in connection with a compass p n,

against the device when in use. An important feature of the invention is that the attachment is adapted to be applied to any standard pen, and may be so applied readily by simply removing the adjusting and is then secured by rewithout necessitating any change whatever in the pen itself or the substitution for any of its parts of any other Another feature relates toveeonomy of "manufacture. llt is desirable that the part of the adjusting device on which the-finger of the user is brought to bear to hold the blades in the adj-ustment'first described for making a finer line, should be sufliciently wide and smooth'in order not to cause dis- ;co-m-fort to the user. It is also desirable that theparts of the attachment should be capable of production at as low cost as-pos- These desirable ends are secured, in

wh ch the :oc m le e m de ieme. plsc final adjustment of the blades,

is regulatedby the adjustment of the screw :tlOIl,

or other instrument of sutzhnature that the users finger can not be pressed the users finger is .09 1- in large quantities by a sheet or flat bar of metal having the necessary thickness by a punch having vthe required outline in cooperation with a die of the same outline;

or by sawing or cutting short lengths from a bar previously drawn or molded or manufactured by any desired suitable method to the shape in cross sertion eorresponding to the required shape of the cam lever. The

screw abutment with the wide head maybe readily and inexpensively made by any of the known methods of screw manufacture. making the cam lever and that portion thereof which receives the impression of the users finger of two partsin the manner above described, it may be produced more easily and cheaply than if the wide finger surface were formed as an integral partof the cam lever, for instance, while the Wide head 28 also may be easily rolled between the users thumb and fore-finger to adjust the abutment and thereby enables this func tion to be easily performed without the use of a screw driver .or other tool. In addithe broad wearing surfaces of the cam 24:, arm 23 (that is ofthe heels) and :of the pivot are a feature of great practical utility, possessing obvious and decided superiority over devices heretofore suggested for generall similar purposes (although differing wic ely from this device in construction) wherein are found pointed projections designed to travel over and press against the blade of a p n- "What I claim and desire to secure by'Letters Patent is:

-1. A detachable adjusting device'comprising a base, a can lever pivoted to said base and hav ng heels at opposite sides of its a pivot, and abutments for limiting the throw. tofysaid lever in either direction, each of sand abutments being independently adj-u stable to alter such limit of throw in each direction without aife'cting the limit set to throw in the opposite direction.

'2. The combination w-i h 'a pair of separated members relatively adjustable, the one toward and away from the other, of'an adjusting device comprising a base rigidly engaged with one of said members, and a cam lever pivoted to said base having a heel arnanged to hear at one side of its pivot on the other of said members, and an adjustable abutment'carried by said cam lever adapted to bear against one of the-members at the same side of the pivot as said heel to limit the throw .of'tliepam lever.

3. The combination with pair of-scparated relatively movable members and an -in l ss r t rea ed -0n ?et ai ing a base member, a cam lever pivoted to said base member and having two heels 'adapted other blade,

other blade,

members and passing through, with its head adapted to bear on the other, of an adjust ing attachment comprising a base member to be held by said screw between the head thereof and the member on which said head is adapted to bear, and a cam member pivoted to said base and arranged to bear against one of the relatively adjustable members.

4. The combination with a drawing pen comprising a pair of separated relatively adjustable blades and an adjusting screw in threaded engagement with one of said blades and bearing against the other blade, of an adjusting device comprising a base member held between the head of said screw and the adjacent blade, and a cam lever pivoted to said base member and adapted to bear against the adjacent blade.

5. A detachable adjusting device comprisspaced apart from one another and located at respectively opposite sides of a line passing through the pivot, and two abutments 0n said cam lever on respectively opposite sides of the same line.

6. The combination with a drawing pen of a base member detachably engageable with said pen and a cam lever pivoted to said base member and having heels spaced apart and arranged to bear on one of the arms of the pen at points on opposite sides of a line perpendicular to said arm passing through the pivot of said lever, and abut ments carried by said lever on respectively op osite sides of the same line.

The combination with a drawing pen having separated relatively adjustable blades and an adjusting head connected with one of the blades and adapted to bear on the of an adjusting attachment comprising a base member clamped between said adjusting head and the adjacent blade,

a cam lever pivoted to said base member having an arm extending over said adjusting head and having a heel arranged to bear on the adjacent blade, and an abut- 'ment screw threaded into said arm projecting toward the adjusting head and adapted to be screwed in or out whereby to vary the distance of its projection toward such head and thus to alter the limit of movement of said cam heel.

'8. The combination with a drawing pen having separated relatively adjustable blades and an adjusting head connected with one of the blades and adapted to bear on the of an adjusting attachment comprising a base member clamped between said adjusting head and the adjacent blade, a cam lever pivoted to said base member having an arm extending over said adjusting head and having a heel arranged to bear on the adjacent blade, and an abutment screw passing through said arm projecting toward the adjusting head, and itself having a head by which it may be set.

9 The combination with a drawing pen having separated relatively adjustable blades, of a cam lever and means for connecting said cam lever to one of said blades in a manner adapting it to bear on the other of said blades for adjusting the distance between the blades, said cam lever being constructed as a piece of metal having uniform thickness and having an adjustable abutment passing through it remote from its pivot and provided with a wide head, said head constituting both a bearing surface for receiving the pressure of the users finger and as a means for adjusting the abutment.

10. The combination with a drawing pen having relatively adjustable blades of an adjusting device comprising a cam lever and means for connecting said cam lever to the pen; said cam lever being pivoted to said connecting means and having heels on opposite sides of its pivot constructed and arranged to bear on one of the blades of the pen over extended bearing areas, and having an arm by which it may be moved, one of said heels having sliding contact with such blade when the cam lever is moved in one direction, and the other heel having sliding contact with movement in the opposite direction, one of said heels being also adapted to pass from a position at one side of a line through its pivot perpendicular to the pen blade, to a position at the other side of said line, and an abutment carried by the cam lever adapted to contact with the blade when the last named heel has been moved into the last named position.

11. The combination with, a drawing pen having separated blades one of which is adjustable toward and away from the other, of an adjusting screw threaded into one of said blades and having a head to bear upon the other blade, and an attachment comprising a base confined between the head of said screw and the adjacent blade, a cam lever pivoted to said base and having an operating arm extending over the head of said screw, and a screw abutment passing through said arm projecting toward the head of said adjusting screw, and itself having a head arranged on the outer side of said arm, the cam lever having substantially uniform thickness whereby it may be punched from sheet metal or cut from a bar, and the head of said screw abutment being sufliciently wide to provide a bearing surface to receive the pressure of a finger of the user.

12. An attachment of the character indicated comprising a base member, a cam lever pivoted to said base member and having a pressure applying heel and an operating arm, and an abutment screw threaded through said arm to limit variably the throw of said lever and having a wide head on the other side of the arm, said cam lever being of substantially uniform thickness whereby it may be constructed as a punching from sheet metal, and the head of said abutment screw affording a surface for application of pressure by the finger of the user.

13. In a device of the character described the combination of a pen having a pair of blades and an adjusting screw with a head, a supporting base having an opening supported on one of said blades and clamped in position on said blades by means of said adjusting screw, a cam lever pivoted to said base having a pair of heels, an operating arm formed with said lever, and an adjusting screw in threaded engagement with said arm adapted to bear on the head of the first adjusting screw when pressure is brought on said arm and either of said heels being enabled to bearon one of said blades.

14. In a device of the character described the combination of a pen with a pair of blades and an adjusting screw with a head, a supporting base having an opening sup ported on one of said blades and clamped thereto by said adjusting screw which passes through said opening, a cam lever pivoted to said base having a pair of disposed heels formed therewith, with either heel adapted to bear upon and move one of said blades, an operating arm formed with said lever, an adjusting stop screw carried on the arm to bear against the head of the said adjusting screw, said stop screw coacting with one of said heels to adjust the position of one of said blades, and an ad justing stop screw carried by said lever v to bear against one of said blades and to ooact with the other heel to locate said blade in a predetermined position.

In testimony whereof I have afiixed my signature. 1

AXEL E. NORRMAN.

copies of this patent may be obtained for five cents each, by addressing the "Gommissloner of latents,

, Washington, D. G.

pp ositely 

